/*
 * Copyright 2019 New Vector Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package im.vector.matrix.android.internal.session.room.timeline

internal enum class PaginationDirection(val value: String) {
    /**
     * Forwards when the event is added to the end of the timeline.
     * These events come from the /sync stream or from forwards pagination.
     */
    FORWARDS("f"),

    /**
     * Backwards when the event is added to the start of the timeline.
     * These events come from a back pagination.
     */
    BACKWARDS("b");

    fun reversed(): PaginationDirection {
        return when (this) {
            FORWARDS  -> BACKWARDS
            BACKWARDS -> FORWARDS
        }
    }
}
